While the human genome shows that we are all in fact very similar to one another at the DNA sequence level, small (and sometimes) large changes do occur. How much do we as unrelated humans differ at the DNA level in terms of the number of base pair (bp) differences

Lower than 0.01%

Explanation:

The human genome has around three (3) billion base pairs long. It has been suggested that the difference among human genomic sequences is around 1 nucleotide change per 1,200 -1,500 bases, it means that the differences are lower than 0.01%.  The nucleotide differences may be due to deleterious mutations, but the vast majority of these differences correspond to neutral mutations

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